MG ZS EV Granny charger only charging at 1.5kW

[kaush]

Hi guys,

I have been noticing that my home charging using the provided MG ZS EV car charger, only charges with ~1.5kW all the time. Even the SOC is like 50% it does not consume like ~2.3kW that it should be capable of. Any ideas why?

Cheers.
Kay

 

[Jomarkh]

How much does it pull on a 7kW EVSE?
Could you try the 'granny' on a friend's car or take it back to your dealer and try it on their car?

 

[N2STY]

I believe it has some safety stuff built in as it monitors the cpc as well you could have a small earth problem on your ring? Have you got different socket to try on different ring ie upstairs or kitchen maybe?
Or maybe your using a extension lead not thick enough for the run you really need 3x 2.5 mm min if using lead
One more thing is you may need to check supply voltage it not always the desired amount

 

[kaush]

Hey guys, Thanks. I am charging it using my 10A wall outlet in the garage. I have tried it in one more place, but also it was quite slow. I will try one more place to be sure it is not inlet related issue.

How much does it pull on a 7kW EVSE?
Could you try the 'granny' on a friend's car or take it back to your dealer and try it on their car?

I have tried rapid chargers like 22kW and 50kW. I havent noticed this issue. So I am inclined to think this is a charger related problem. Unfortunately I dont have another charger to try it out.

 

[kaush]

I believe it has some safety stuff built in as it monitors the cpc as well you could have a small earth problem on your ring? Have you got different socket to try on different ring ie upstairs or kitchen maybe?
Or maybe your using a extension lead not thick enough for the run you really need 3x 2.5 mm min if using lead
One more thing is you may need to check supply voltage it not always the desired amount

This is from my wall socket in the garage. I have tried one more home but the result was same. I will try another place just to be sure. Also I can try different socket with a thick extension. Will update my findings.

 

[N2STY]

Hey guys, Thanks. I am charging it using my 10A wall outlet in the garage. I have tried it in one more place, but also it was quite slow. I will try one more place to be sure it is not inlet related issue.

I have tried rapid chargers like 22kW and 50kW. I havent noticed this issue. So I am inclined to think this is a charger related problem. Unfortunately I dont have another charger to try it out.

What's the constant draw rating of a 10 amp socket over there
Here in the UK a 13amp socket is only rated at 10amps constant
You granny may be set up for safety for your country ?

 

[kaush]

What's the constant draw rating of a 10 amp socket over there
Here in the UK a 13amp socket is only rated at 10amps constant
You granny may be set up for safety for your country ?

hmm interesting. As far as I know here its a 10A circuit with 10A MCBs. The granny charger labels says rated current as 8A. I have written to my MG dealer, lets see what he says.

 

[kaush]

I came across this article - Choosing a home fast charger
This indicates the 1.5kW is the charger just keeping the vehicle out awake. Hard to believe MG not fixing something like this in their own gear.

 

[RobinH]

It does sound like something is causing it to drop down to a 6A "safe mode".
Realistically, home electrics are not designed for multi-hour 10A draw. Relying on the granny charger as your main charger is going to be frustrating and potentially dangerous. I strongly recommend investing in a 7kWh dedicated charger.

 

[DB Go Rex]

+1 on that suggestion.

Granny charger is only really an occasional use type thing.

Invest in a 7kw charger.

 

[fatboyfat1981]

The granny charger labels says rated current as 8A

Thats your answer- 8 amps @ 230v minus conversion loss is about 1.5kW.

 

[N2STY]

Thats your answer- 8 amps @ 230v minus conversion loss is about 1.5kW.

This is what I tried to say about consistent draw for different countries

 

[SteveHOBART]

I’m in Australia also and can only charge at 1.5kW with the granny charger, the power point I’m using can actually deliver up to 15 amps (240v) constantly so that really isn’t the issue, I guess maybe it is the MG granny chargers in Aus are only 8amp as said? I only picked my car up 3 days ago so its the only charger I have until the 7kW charger is installed in a couple of weeks. BTW I got the X power and it really does seem chew through the power when driven hard, I would be lucky to be getting 260-300km range, my nearest town is 120km round trip on winding country roads, so two return trips and its done... but it is great fun to drive in the MG.

 

[TomMGZSEV]

Hi guys,
Had this issue resolved?
I'm facing the same issue with multiple mobile chargers.
I have a 10 A charger that display the actual amp of around 10a that delivers to the car but the car app only shows around 8 A charging.
See a video below where a Tesla charged with it mobile charger of 2kW and then getting around 1.5kW plugging into an MG4.


The car I have is an MG ZS EV in Australia and this issue happens with multiple different chargers.

 

[fred12345]

The car I have is an MG ZS EV in Australia and this issues is with multiple different chargers.

My ZS in the UK, on non-MG slow home charger with 13A socket charges at anything between 1.5kW-2.5kW. I don't know what decides the charge level - the car, the charger or it's something else altogether ...
whatever it is, fine with me. if urgent, I will use a fast charger somewhere.

 

[Coulomb]

Yes, the Australian Granny "charger" comes with a 10 A plug, meaning that it's only safe to deliver 80% of that (8 A) for long periods of time. So the Australian EVSE is set to 8 A (around 1.8-1.9 kW). That's likely one of the lowest power limits in the world, apart from countries with mostly 120 V (North America) or 100 V outlets (Japan).

I don't know what decides the charge level - the car, the charger or it's something else altogether ...

AC charging is limited by three factors (the lowest limit applies):

• The on-board charger has a limit; for my Mark 1 ZS EV it's 6.6 kW (at the output I think, so a little more from the charge port, around 29 A). This limit is set by the car.
• The resistor in the charge plug indicates what current the copper cable can safely pass; that's usually 16 A or 32 A. This limit is set by the type 2 cable.
• The control pilot in the EVSE (AC "charger") sets a limit, usually the maximum that its supply cable and its internal relay can handle, but might be throttled lower for special purposes, such as power sharing, or limiting charging to excess solar power). Can be set between 6 and 80 A. This limit is set by a number of considerations.

 

[TomMGZSEV]

Thanks for the reply. I'll upgrade to a 32A outlet soon and try with another charger and let's see the outcome. I'll keep you posted.